Remove login firebase setup, restore chat list firebase setup

lib/pages/chat_list/chat_list.dart

@@ -488,9 +488,7 @@ class ChatListController extends State<ChatList>
       if (mounted) {
         searchServer =
             Matrix.of(context).store.getString(_serverStoreNamespace);
-        // #Pangea
-        // Matrix.of(context).backgroundPush?.setupPush();
-        // Pangea#
+        Matrix.of(context).backgroundPush?.setupPush();
         UpdateNotifier.showUpdateSnackBar(context);
         // #Pangea
         AppVersionUtil.showAppVersionDialog(context);

lib/utils/background_push.dart

@@ -81,8 +81,6 @@ class BackgroundPush {
   void _init() async {
     try {
       // #Pangea
-      onLogin ??=
-          client.onLoginStateChanged.stream.listen(handleLoginStateChanged);
       FirebaseMessaging.instance.getInitialMessage().then(_onOpenNotification);
       FirebaseMessaging.onMessageOpenedApp.listen(_onOpenNotification);
       // Pangea#